"The Thing That Wouldn't Die" is the two-part series finale of the American sitcom 3rd Rock from the Sun. The episode aired on May 22, 2001 on NBC. The action in the episode directly follows that of the previous two-parter "Mary Loves Scoochie", which ended with Dick transforming Dr. Liam Neesam, a malevolent alien played by John Cleese, into a chimpanzee. Therefore, the full finale involves a four-episode story arc.